Cushioned valve-tappet.



' UNITED STATES PATENT OFFICE.

JESSE D. LANGDON, OF WATERVILLE, WASHINGTON, ASSIGNOR TO THE AUXILIARY COOLER COMPANY, A. CORPORATION OF WASHINGTON.

CUSHIONED VALVE-TAPPET.

Specification of Letters Patent.

Patented Oct. 2, 1917.

Application filed November 2, 1916. Seri'a] No. 129,111;

To all whom it may concern:

Be it known that I, Jessa D. LANGDON, a citizen of the United States, residing at Waterville, in the county of Douglas and State of Washington, have invented certain new and useful Improvements in Cushioned Valve-Tappets; and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as W111 enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the class of valve actuating mechanisms, and more particularly to a cushioned valve tappet.

The principal object of the invention is the provision of a tappet arm designed to be elastically interdisposed between the valve and the valve actuating mechanism.

Another object of the invention is to provide the combination with one of the valves andthe cam shaft of an engine of a tappet arm fulcrumed on and elastically positioned between the actuating cam and thevalve, so as to provide continuous contact between the valve and cam.

A further object of the invention is to provide a cushioned valve tappet that will be noiseless in its action and self adjusting so as to compensate for the wear of the valve and the various relative parts of the device.

With these and other objects in view as will appear as the description proceeds, the invention comprises the various novel features of construction, combination and arrangement of arts as will be more full described hereinafter and set forth wit particularity in the appended claims.

Referring to the drawings,

Figure 1 is a vertical transverse sectional view of my improved cushioned valve tappet shown applied to a demountable cylinder head wherein an overhead valve is used.

Fig. 2 is a vertical transverse sectional view through an L head type of motor showing another way in which my improved cushioned valve tappet may be used.

Similar characters of reference are used to denote like parts throu bout the accompanying drawings and t e following description.

Referring more particularly to the drawings, the reference numeral 1 indicates an upper fragmentary portion of a demountvided at its lower end with a valve head 5 designed to seat against the valve seat 6 under the action 0 the valve s ring! arranged upon the upper end 0 the valve stem. This valve spring 7 is of the usual construction and is held-upon the valve stem throu h the medium of the usual spring cap 8 hel in place bl a valve stem pm or key 9 that is passed t rough a slot the u per free end of the valve stem 4 and rests within the spring cap as clearly shown.

The upper free end of the valve stem, in this instance isishown to be rounded as indicated by the numeral 10 but I desire to have it understood that the valve stem may be made flat upon its upper end or of any other desired construction. Resting upon this upper end of the valve stem is one endof a tappet arm 11 which in this instance is provided on its under face with an enlargement or boss 12 that is provided with a countersunk or depression 13 designed to receive the up or end 10 of the valve stem.

s shown this tappet arm 11 is positioned between the valve cam 14 mounted on the cam shaft 15 directly above the tappet arm. It is also to be noted that the tappet arm is disposed horizontally or substantially so between the valve stem and an actuating cam 14 and the o posite end thereof is provided with an e ongated slot 16 for the reception of the upper end of a stud 17. that is threadedly connected with the cylinder head 1 as indicated by the numeral 18. This same end of the tappet arm-is also rovided on its under face with a' depen ing ,circular flange 19 around whichis positioned the upper end of a coil spring 20, the lower end of which rests upon an adjusting nut 21 u on the stud 17. nut, an desired tension may be placed-upon the spring and when such tension has been produced, the adjusting nut may be held in stem 4 and the actuating By the provision of this a justing vide a clamping nut'23 that,is arranged upon the lower end ofthe stud and is designed to be drawn down over a gasket 24 arranged beneath it so as to produce a perfectly tight joint between the stud and the cylinder head, and in cases where the stud 'is screwed through the water act as a fulcrum for the tappet arm, from which it will be seen that as the actuating cam revolves the tappet arm will be actuated to open the valve. Since the actuating cam revolves clockwise, itwill be appar'ent that all lateral thrust upon the valve stem will be obviated by reason of the fact that the outer end of the slot 16 bears againstthe stud 17 as indicated by the'numeral 25.

The tappet arm may be fulcrumed upon the actuating cam at any point intermediate its ends found most desirable, but in this instance it is shown fulc'rurned adjacent the end that engages the valve stem and in view of this fact it will be obvious that the ten sion upon. the spring 20 will be much weakerthan that upon the spring 7 arranged on the valve stem}, and that the nearer the actuating cam is moved into alinement with the valve stem, the less the tension will be upon the spring 20. p

In Fig. 2 of the drawings wlll be seen another way in which my improved cushioned valve tappet may be used, which in this particular mstance is used in connection with the Lheadjype of motor. In this arrangement of the device, the stud 17 is disposed vertically within the crank case 26 and is threadedly connected at its upper end to the top portion 27 of the crank case as indicatedby the numeral 28 and is held in. attached position through the medium of a clamping nut 29 that is designed to bear against the end surface of the top portion 27 of the crank case. V

r The tap et arm 30in this-case is provided with an el dn ated slot 31101 the reception ofthe stud 1 As shown the opposite end of the tap at arm 30 is interdisposed between the ower endpf the valve adjusting rod 32 of the actuating cam 33 mounted on the cam shaft'34 that is disposed longitudinall through the crank case 26.

T e upper end of the valve adjusting rod 32 j is rovided with an adjusting nut 35 which is held iu'adjusted position through the medium of a l k nut 36 This adjusting nut 35 is desaigned to engage the lower free end ofthev ve stem 4 when it is actuated through the medium-0f ,the' cam 33.,

The stud 17 in this instance is rovided likewise with a cushioned spring 28 and an adjusting nut 36 mounted on the lower end of the stud 17 whereby any amount of tensibn may be placed upon the cushioned spring found desirable, such tension nor-" mally being just suflicient to hold and retain the tappet arm 30 in an operative position. As the cam the inner end of the tappet arm' 30 u wardly, which in turn operates to open the valve through the actuation of the valve adjusting rod 32, the outer end being sup- 33 revolves it will move 7 ported and'cushioned by the spring 20, said spring also serving to hold and mamtain the tappet arm in continuous engagement with the cam and the valve adjusting rod.

It is also to be understood from the foregoing that by reason of the expansive force of the springs 20, that sufficient tension will be exerted on the ends of the tappet arms 11 and 30 to always maintain a continuous contact between the valve stem and the actuating cam, and by this continuous contact it will be apparent that all wear of the actuating cam and the other relative arts of the device will becompensated fo by this elastic supporting means.

What I' claim is g y l. The combination with a puppet valve, and valve actuating cam, of a tappet arm havingone end interdisposed between and bearing against the puppet valve and the valve actuating cam, and elastic means for supporting the opposite end of the tappet 2. The combination with a puppet valve, and a valve actuating cam, of an intermediary tappet arm, and variable tension,

the combination with the i spring pressed valve thereof embodying a valve stem. of a tappet arm fulcrumed on and positioned between said cam and valve stem, and means for yieldingly connecting it to the engine, said connecting means serving to cushion the valve tappet arm between the cam and the valve stem. j,

4. In an internal combustion engine, the combination with the cam shaft havin a cam thereonand a spring pressed va ve therefor embodying a valve stem, of a cushioned valve tappet comprising a ta pet arm having one end resting against iih free end of said valve stemamd means yieldingly connecting the op'p'ositeend of said e outer v and tappet arm to the engine, said tappet arm adapted to be fulcrumed on the cam be-. tween its ends and cushioned between the cam, the valve stem and said yielding connecting means.

5. In an internal combustion engine, the combination with the cam shaft having a cam thereon, and a spring pressed valve thereof embodying a valve stem, of a cushioned valve tappet comprising a tappet arm designed to have one end fulcrumed on and] interdisposed between said cam and valve stem, and means for elastically connecting the opposite end of said tappet arm with the engine, said elastic connection serving to cushion the tappet arm between the cam valve stem.

6. The combination with valve actuating mechanism and a puppet valve embodying a valve stem, of a cushioned tappet arm hav ing one end fulcrumed on and interdisposed between said valve actuating mechanism and valve stem, elastic tensioned means for supporting the opposite end of: said tappet arm and serving to hold and maintain said tappet arm in continuous contact with the valve actuating mechanism and the valve stem, and means for varying the tension of said supporting means.

7. The combination with valve actuating mechanism, and a puppet valve, of a tappet arm having one end fulcrumed on and interdisposed between said valve actuating mechanism and said valve, and means to elastically support the opposite end of said tappet arm, said elastic supporting means pensated for.

adapted to exert a tension on the tappet arm to hold said tappet arm in continuous contact with said valve actuating mechanism and puppet valve, whereby wear between said parts will be automatically com- 8. The combination with a puppet valve, and valve operating mechanism, of a lever fulcrumed on the valve mechanism and having one end elastically positioned between the puppet valve and the valve operating mechanism, and elastic supporting means for supporting the other end of the lever, said elastic supporting means serving as the sole means of elastically supporting the lever in operative position between the puppet valve and the valve operating mechanism.

9. The combination with a puppet valve, and valve actuating mechanism, of a tappet arm interdisposed between the puppet valve and the valve actuating mechanism, resilient means engaging said tappet arm to yieldin position between the ingly support it. puppet valve-and the valve actuating mechanlsm, and additional means engaging the tappet arm to prevent lateral thrust of the tappet arm against the puppet valve.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JESSE D. LANGDON.

Witnesses:

S. W. OOCKRELL, FRANK B. HOFFMAN. 

